Comic Title: Challengers of the Unknown #47
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: Dec/Jan 1965
On Sale Date: October 7, 1965 Copyright Date October 7, 1965
Source: Library of Congress, Periodicals 1965

Frequency: Bi-monthly
Cover Price: $0.12
Page Count: 32
Editor: Murray Boltinoff

Title: "The Terrors of Mr. Tic-Tac-Toe"
Pages: 13

Feature(s):
Challengers of the Unknown (of Earth-1)

Writer: France E. Herron
Artist: Bob Brown

Feature Character(s)

• Challengers of the Unknown (last appearance in Challengers of the Unknown #44; next appearance in Challengers of the Unknown #43)
• Ace Morgan (last appearance in Challengers of the Unknown #44; next appearance in Challengers of the Unknown #43)
• Rocky Davis (last appearance in Challengers of the Unknown #44; next appearance in Challengers of the Unknown #43)
• Red Ryan (last appearance in Challengers of the Unknown #44; next appearance in Challengers of the Unknown #43)
• Prof. Haley (last appearance in Challengers of the Unknown #44; next appearance in Challengers of the Unknown #43)

Villain(s)

• Mr. Tic-Tac-Toe (alias Dr. Bradford; no further appearances)
• Herbert (no further appearances)

Other Character(s)

• An unnamed scientist (no further appearances)

Comments:
This story is from the "Challenger Casebook" and is an untold story. Since the Challengers are in their old purple uniforms it must take place prior to the second story of Challengers of the Unknown #43.

Synopsis:
The Challengers are given a vial containing a newly discovered substance for delivery to a lab in Washington. On the journey, their plane mysteriously runs low on fuel forcing them to land in the desert. They seek help in a nearby mining town where Ace, Rocky, and Red are captured by a man calling himself Mr. Tic-Tac-Toe. The Challs are then tied to a giant gameboard. Prof is ordered to turn over the vial to save his friends. He tricks the crook by substituting tear gas in the vial. The Challs capture the villain, who turns out to be a lab assistant. The new substance can create diamonds and is extremely valuable motivating the attempt to steal it.